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Assembly comprising an electrostatic sound generator and a transformer

a technology transformer, which is applied in the manufacture/assembly of earpieces/earphones, semiconductor electrostatic transducers, loudspeakers, etc., can solve the problems of high voltage requirements of electrostatic sound generators, large second-order distortion of single-sided electrostatic sound generators, and high cos

Active Publication Date: 2020-06-16
SONION NEDERLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]As mentioned above, it is possible to drive the sound generator at or near its resonance peak, whereby less power and / or voltage is required to obtain the desired sound pressure. Thus, the ratio of the winding numbers may be decreased, whereby the transformer may be made smaller relative to the transformers used for electrostatic sound generators operated further away from their resonance frequencies. Electret sound generators may advantageous be operated away from their resonance frequencies.
[0094]In yet another aspect the invention relates to an assembly comprising a first and a second sound generator as described in relation to the first aspect and a third housing having a sound outlet, the first and second sound generators positioned in the third housing. This has the advantage that the sound generators output sound from a single sound output. This sound output may be provided with a spout if desired.

Problems solved by technology

Electrostatic sound generators however require high voltages which hitherto have been provided using expensive amplifiers or space-consuming transformers.
Single-sided electrostatic sound generators are renowned to have a lot of second order distortion in that the force between the diaphragm and the single back plate varies with the distance between these elements.

Method used

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  • Assembly comprising an electrostatic sound generator and a transformer
  • Assembly comprising an electrostatic sound generator and a transformer
  • Assembly comprising an electrostatic sound generator and a transformer

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Embodiment Construction

[0105]In FIG. 1, a standard electrostatic sound generator 16 is illustrated having a housing 161, the inner space thereof being divided into two chambers 162 and 164 by a diaphragm 166. The housing 161 has a sound output 169 for outputting sound from the space 162, which usually is denoted a front chamber, where the space 164 then is denoted a back chamber. The back chamber may be completely sealed, may have a so-called vent, or may have a sound output of its own.

[0106]A back plate 168 is illustrated being positioned in the front chamber 162. It may equally well be positioned in the back chamber 164. The back plate is positioned parallel to and rather close to the diaphragm and is usually provided with a number of openings so that air may pass through it and into the remainder of the chamber 162. However, naturally, the back plate may be non-perforated and form a wall or inner surface of the chamber in which the back plate is provided.

[0107]The sound generator operates by a force be...

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Abstract

An assembly of a transformer and an electrostatic sound generator is especially efficient if the resonance frequency of the diaphragm is in the frequency range in which the generator is operated, such as in the interval of 1-20 kHz. Then, a smaller transformer with a winding ratio of 5000 or less may be used for feeding the sound generator, making the assembly suitable for hearing aid purposes or in-ear products such as for pro audio use.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of European Patent Application Serial No. 16153086.0, filed Jan. 28, 2016, and European Patent Application Serial No. 16157222.7, filed Feb. 24, 2016, both of which are incorporated herein by reference in their entireties.FIELD OF THE INVENTION[0002]The present invention relates to an assembly comprising an electrostatic sound generator and a transformer. Sound generators and assemblies of the invention may be used in hearing aids or other sound generators such as headphones or in-ear speakers for e.g. professionals such as musicians. Electrostatic sound generators are known from U.S. Pat. No. 3,943,304 describing a headphone with an electrostatic transducer fed by a transformer, US2014 / 0064510 describing an electrostatic earphone fed by an amplifier, CN203788451 describing headphones with electrostatic transducers fed by transformers and EP1871141 describing a combination of a tweeter and a woofer.BACK...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04R19/02H04R1/24H04R19/04H04R19/00H04R3/14H04R1/10
CPCH04R19/005H04R3/14H04R19/04H04R19/02H04R1/24H04R1/1075H04R2201/003H04R19/013
Inventor VOSS, RASMUSVAN OOSTEN, HAICOGROFFEN, CAMIEL EUGÈNEDE RUIJTER, LAURENSVAN GILST, KOENBLOM, FREDERIK CORNELIS
Owner SONION NEDERLAND
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